java compiler level does not match the version of the installed java project facet

java compiler level does not match the version of the installed java project facet錯誤的解決 因工作的關係，Eclipse開發的Java項目拷來拷去，有時候會報一個很奇怪的錯誤。明明源碼一模一樣，爲什麼項目複製到另一臺機器上，就會報「java compiler level does not match the ver

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